RE: [PATCH v7 01/28] iommufd: Report unmapped bytes in the error path of iopt_unmap_iova_range

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To: Nicolin Chen <nicolinc@xxxxxxxxxx>, "jgg@xxxxxxxxxx" <jgg@xxxxxxxxxx>, "corbet@xxxxxxx" <corbet@xxxxxxx>, "will@xxxxxxxxxx" <will@xxxxxxxxxx>
Subject: RE: [PATCH v7 01/28] iommufd: Report unmapped bytes in the error path of iopt_unmap_iova_range
From: "Tian, Kevin" <kevin.tian@xxxxxxxxx>
Date: Wed, 2 Jul 2025 09:39:47 +0000
Accept-language: en-US
Cc: "bagasdotme@xxxxxxxxx" <bagasdotme@xxxxxxxxx>, "robin.murphy@xxxxxxx" <robin.murphy@xxxxxxx>, "joro@xxxxxxxxxx" <joro@xxxxxxxxxx>, "thierry.reding@xxxxxxxxx" <thierry.reding@xxxxxxxxx>, "vdumpa@xxxxxxxxxx" <vdumpa@xxxxxxxxxx>, "jonathanh@xxxxxxxxxx" <jonathanh@xxxxxxxxxx>, "shuah@xxxxxxxxxx" <shuah@xxxxxxxxxx>, "jsnitsel@xxxxxxxxxx" <jsnitsel@xxxxxxxxxx>, "nathan@xxxxxxxxxx" <nathan@xxxxxxxxxx>, "peterz@xxxxxxxxxxxxx" <peterz@xxxxxxxxxxxxx>, "Liu, Yi L" <yi.l.liu@xxxxxxxxx>, "mshavit@xxxxxxxxxx" <mshavit@xxxxxxxxxx>, "praan@xxxxxxxxxx" <praan@xxxxxxxxxx>, "zhangzekun11@xxxxxxxxxx" <zhangzekun11@xxxxxxxxxx>, "iommu@xxxxxxxxxxxxxxx" <iommu@xxxxxxxxxxxxxxx>, "linux-doc@xxxxxxxxxxxxxxx" <linux-doc@xxxxxxxxxxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>, "linux-arm-kernel@xxxxxxxxxxxxxxxxxxx" <linux-arm-kernel@xxxxxxxxxxxxxxxxxxx>, "linux-tegra@xxxxxxxxxxxxxxx" <linux-tegra@xxxxxxxxxxxxxxx>, "linux-kselftest@xxxxxxxxxxxxxxx" <linux-kselftest@xxxxxxxxxxxxxxx>, "patches@xxxxxxxxxxxxxxx" <patches@xxxxxxxxxxxxxxx>, "mochs@xxxxxxxxxx" <mochs@xxxxxxxxxx>, "alok.a.tiwari@xxxxxxxxxx" <alok.a.tiwari@xxxxxxxxxx>, "vasant.hegde@xxxxxxx" <vasant.hegde@xxxxxxx>, "dwmw2@xxxxxxxxxxxxx" <dwmw2@xxxxxxxxxxxxx>, "baolu.lu@xxxxxxxxxxxxxxx" <baolu.lu@xxxxxxxxxxxxxxx>
In-reply-to: <102e38967b38c28abbe8ebe70b39dcc8e14450ba.1750966133.git.nicolinc@nvidia.com>
References: <cover.1750966133.git.nicolinc@nvidia.com> <102e38967b38c28abbe8ebe70b39dcc8e14450ba.1750966133.git.nicolinc@nvidia.com>

> From: Nicolin Chen <nicolinc@xxxxxxxxxx>
> Sent: Friday, June 27, 2025 3:35 AM
> 
> There are callers that read the unmapped bytes even when rc != 0. Thus, do
> not forget to report it in the error path too.
> 
> Fixes: 8d40205f6093 ("iommufd: Add kAPI toward external drivers for kernel
> access")
> Cc: stable@xxxxxxxxxxxxxxx
> Signed-off-by: Nicolin Chen <nicolinc@xxxxxxxxxx>

Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>

References:
- [PATCH v7 00/28] iommufd: Add vIOMMU infrastructure (Part-4 HW QUEUE)
  - From: Nicolin Chen
- [PATCH v7 01/28] iommufd: Report unmapped bytes in the error path of iopt_unmap_iova_range
  - From: Nicolin Chen

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